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-rw-r--r--lib/dns/db.c1139
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diff --git a/lib/dns/db.c b/lib/dns/db.c
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+++ b/lib/dns/db.c
@@ -0,0 +1,1139 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+/***
+ *** Imports
+ ***/
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <isc/buffer.h>
+#include <isc/mem.h>
+#include <isc/once.h>
+#include <isc/rwlock.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include <dns/callbacks.h>
+#include <dns/clientinfo.h>
+#include <dns/db.h>
+#include <dns/dbiterator.h>
+#include <dns/log.h>
+#include <dns/master.h>
+#include <dns/rdata.h>
+#include <dns/rdataset.h>
+#include <dns/rdatasetiter.h>
+#include <dns/result.h>
+
+/***
+ *** Private Types
+ ***/
+
+struct dns_dbimplementation {
+ const char *name;
+ dns_dbcreatefunc_t create;
+ isc_mem_t *mctx;
+ void *driverarg;
+ ISC_LINK(dns_dbimplementation_t) link;
+};
+
+/***
+ *** Supported DB Implementations Registry
+ ***/
+
+/*
+ * Built in database implementations are registered here.
+ */
+
+#include "rbtdb.h"
+
+static ISC_LIST(dns_dbimplementation_t) implementations;
+static isc_rwlock_t implock;
+static isc_once_t once = ISC_ONCE_INIT;
+
+static dns_dbimplementation_t rbtimp;
+
+static void
+initialize(void) {
+ isc_rwlock_init(&implock, 0, 0);
+
+ rbtimp.name = "rbt";
+ rbtimp.create = dns_rbtdb_create;
+ rbtimp.mctx = NULL;
+ rbtimp.driverarg = NULL;
+ ISC_LINK_INIT(&rbtimp, link);
+
+ ISC_LIST_INIT(implementations);
+ ISC_LIST_APPEND(implementations, &rbtimp, link);
+}
+
+static dns_dbimplementation_t *
+impfind(const char *name) {
+ dns_dbimplementation_t *imp;
+
+ for (imp = ISC_LIST_HEAD(implementations); imp != NULL;
+ imp = ISC_LIST_NEXT(imp, link))
+ {
+ if (strcasecmp(name, imp->name) == 0) {
+ return (imp);
+ }
+ }
+ return (NULL);
+}
+
+/***
+ *** Basic DB Methods
+ ***/
+
+isc_result_t
+dns_db_create(isc_mem_t *mctx, const char *db_type, const dns_name_t *origin,
+ dns_dbtype_t type, dns_rdataclass_t rdclass, unsigned int argc,
+ char *argv[], dns_db_t **dbp) {
+ dns_dbimplementation_t *impinfo;
+
+ RUNTIME_CHECK(isc_once_do(&once, initialize) == ISC_R_SUCCESS);
+
+ /*
+ * Create a new database using implementation 'db_type'.
+ */
+
+ REQUIRE(dbp != NULL && *dbp == NULL);
+ REQUIRE(dns_name_isabsolute(origin));
+
+ RWLOCK(&implock, isc_rwlocktype_read);
+ impinfo = impfind(db_type);
+ if (impinfo != NULL) {
+ isc_result_t result;
+ result = ((impinfo->create)(mctx, origin, type, rdclass, argc,
+ argv, impinfo->driverarg, dbp));
+ RWUNLOCK(&implock, isc_rwlocktype_read);
+ return (result);
+ }
+
+ RWUNLOCK(&implock, isc_rwlocktype_read);
+
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_DB,
+ ISC_LOG_ERROR, "unsupported database type '%s'", db_type);
+
+ return (ISC_R_NOTFOUND);
+}
+
+void
+dns_db_attach(dns_db_t *source, dns_db_t **targetp) {
+ /*
+ * Attach *targetp to source.
+ */
+
+ REQUIRE(DNS_DB_VALID(source));
+ REQUIRE(targetp != NULL && *targetp == NULL);
+
+ (source->methods->attach)(source, targetp);
+
+ ENSURE(*targetp == source);
+}
+
+void
+dns_db_detach(dns_db_t **dbp) {
+ /*
+ * Detach *dbp from its database.
+ */
+
+ REQUIRE(dbp != NULL);
+ REQUIRE(DNS_DB_VALID(*dbp));
+
+ ((*dbp)->methods->detach)(dbp);
+
+ ENSURE(*dbp == NULL);
+}
+
+bool
+dns_db_iscache(dns_db_t *db) {
+ /*
+ * Does 'db' have cache semantics?
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+
+ if ((db->attributes & DNS_DBATTR_CACHE) != 0) {
+ return (true);
+ }
+
+ return (false);
+}
+
+bool
+dns_db_iszone(dns_db_t *db) {
+ /*
+ * Does 'db' have zone semantics?
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+
+ if ((db->attributes & (DNS_DBATTR_CACHE | DNS_DBATTR_STUB)) == 0) {
+ return (true);
+ }
+
+ return (false);
+}
+
+bool
+dns_db_isstub(dns_db_t *db) {
+ /*
+ * Does 'db' have stub semantics?
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+
+ if ((db->attributes & DNS_DBATTR_STUB) != 0) {
+ return (true);
+ }
+
+ return (false);
+}
+
+bool
+dns_db_isdnssec(dns_db_t *db) {
+ /*
+ * Is 'db' secure or partially secure?
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0);
+
+ if (db->methods->isdnssec != NULL) {
+ return ((db->methods->isdnssec)(db));
+ }
+ return ((db->methods->issecure)(db));
+}
+
+bool
+dns_db_issecure(dns_db_t *db) {
+ /*
+ * Is 'db' secure?
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0);
+
+ return ((db->methods->issecure)(db));
+}
+
+bool
+dns_db_ispersistent(dns_db_t *db) {
+ /*
+ * Is 'db' persistent?
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+
+ return ((db->methods->ispersistent)(db));
+}
+
+dns_name_t *
+dns_db_origin(dns_db_t *db) {
+ /*
+ * The origin of the database.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+
+ return (&db->origin);
+}
+
+dns_rdataclass_t
+dns_db_class(dns_db_t *db) {
+ /*
+ * The class of the database.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+
+ return (db->rdclass);
+}
+
+isc_result_t
+dns_db_beginload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+ /*
+ * Begin loading 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(DNS_CALLBACK_VALID(callbacks));
+
+ return ((db->methods->beginload)(db, callbacks));
+}
+
+isc_result_t
+dns_db_endload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+ dns_dbonupdatelistener_t *listener;
+
+ /*
+ * Finish loading 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(DNS_CALLBACK_VALID(callbacks));
+ REQUIRE(callbacks->add_private != NULL);
+
+ for (listener = ISC_LIST_HEAD(db->update_listeners); listener != NULL;
+ listener = ISC_LIST_NEXT(listener, link))
+ {
+ listener->onupdate(db, listener->onupdate_arg);
+ }
+
+ return ((db->methods->endload)(db, callbacks));
+}
+
+isc_result_t
+dns_db_load(dns_db_t *db, const char *filename, dns_masterformat_t format,
+ unsigned int options) {
+ isc_result_t result, eresult;
+ dns_rdatacallbacks_t callbacks;
+
+ /*
+ * Load master file 'filename' into 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+
+ if ((db->attributes & DNS_DBATTR_CACHE) != 0) {
+ options |= DNS_MASTER_AGETTL;
+ }
+
+ dns_rdatacallbacks_init(&callbacks);
+ result = dns_db_beginload(db, &callbacks);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ result = dns_master_loadfile(filename, &db->origin, &db->origin,
+ db->rdclass, options, 0, &callbacks, NULL,
+ NULL, db->mctx, format, 0);
+ eresult = dns_db_endload(db, &callbacks);
+ /*
+ * We always call dns_db_endload(), but we only want to return its
+ * result if dns_master_loadfile() succeeded. If dns_master_loadfile()
+ * failed, we want to return the result code it gave us.
+ */
+ if (eresult != ISC_R_SUCCESS &&
+ (result == ISC_R_SUCCESS || result == DNS_R_SEENINCLUDE))
+ {
+ result = eresult;
+ }
+
+ return (result);
+}
+
+isc_result_t
+dns_db_serialize(dns_db_t *db, dns_dbversion_t *version, FILE *file) {
+ REQUIRE(DNS_DB_VALID(db));
+ if (db->methods->serialize == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+ return ((db->methods->serialize)(db, version, file));
+}
+
+isc_result_t
+dns_db_dump(dns_db_t *db, dns_dbversion_t *version, const char *filename) {
+ return ((db->methods->dump)(db, version, filename,
+ dns_masterformat_text));
+}
+
+/***
+ *** Version Methods
+ ***/
+
+void
+dns_db_currentversion(dns_db_t *db, dns_dbversion_t **versionp) {
+ /*
+ * Open the current version for reading.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0);
+ REQUIRE(versionp != NULL && *versionp == NULL);
+
+ (db->methods->currentversion)(db, versionp);
+}
+
+isc_result_t
+dns_db_newversion(dns_db_t *db, dns_dbversion_t **versionp) {
+ /*
+ * Open a new version for reading and writing.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0);
+ REQUIRE(versionp != NULL && *versionp == NULL);
+
+ return ((db->methods->newversion)(db, versionp));
+}
+
+void
+dns_db_attachversion(dns_db_t *db, dns_dbversion_t *source,
+ dns_dbversion_t **targetp) {
+ /*
+ * Attach '*targetp' to 'source'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0);
+ REQUIRE(source != NULL);
+ REQUIRE(targetp != NULL && *targetp == NULL);
+
+ (db->methods->attachversion)(db, source, targetp);
+
+ ENSURE(*targetp != NULL);
+}
+
+void
+dns_db_closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit) {
+ dns_dbonupdatelistener_t *listener;
+
+ /*
+ * Close version '*versionp'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0);
+ REQUIRE(versionp != NULL && *versionp != NULL);
+
+ (db->methods->closeversion)(db, versionp, commit);
+
+ if (commit) {
+ for (listener = ISC_LIST_HEAD(db->update_listeners);
+ listener != NULL; listener = ISC_LIST_NEXT(listener, link))
+ {
+ listener->onupdate(db, listener->onupdate_arg);
+ }
+ }
+
+ ENSURE(*versionp == NULL);
+}
+
+/***
+ *** Node Methods
+ ***/
+
+isc_result_t
+dns_db_findnode(dns_db_t *db, const dns_name_t *name, bool create,
+ dns_dbnode_t **nodep) {
+ /*
+ * Find the node with name 'name'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(nodep != NULL && *nodep == NULL);
+
+ if (db->methods->findnode != NULL) {
+ return ((db->methods->findnode)(db, name, create, nodep));
+ } else {
+ return ((db->methods->findnodeext)(db, name, create, NULL, NULL,
+ nodep));
+ }
+}
+
+isc_result_t
+dns_db_findnodeext(dns_db_t *db, const dns_name_t *name, bool create,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo, dns_dbnode_t **nodep) {
+ /*
+ * Find the node with name 'name', passing 'arg' to the database
+ * implementation.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(nodep != NULL && *nodep == NULL);
+
+ if (db->methods->findnodeext != NULL) {
+ return ((db->methods->findnodeext)(db, name, create, methods,
+ clientinfo, nodep));
+ } else {
+ return ((db->methods->findnode)(db, name, create, nodep));
+ }
+}
+
+isc_result_t
+dns_db_findnsec3node(dns_db_t *db, const dns_name_t *name, bool create,
+ dns_dbnode_t **nodep) {
+ /*
+ * Find the node with name 'name'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(nodep != NULL && *nodep == NULL);
+
+ return ((db->methods->findnsec3node)(db, name, create, nodep));
+}
+
+isc_result_t
+dns_db_find(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version,
+ dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+ dns_dbnode_t **nodep, dns_name_t *foundname,
+ dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
+ /*
+ * Find the best match for 'name' and 'type' in version 'version'
+ * of 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(type != dns_rdatatype_rrsig);
+ REQUIRE(nodep == NULL || *nodep == NULL);
+ REQUIRE(dns_name_hasbuffer(foundname));
+ REQUIRE(rdataset == NULL || (DNS_RDATASET_VALID(rdataset) &&
+ !dns_rdataset_isassociated(rdataset)));
+ REQUIRE(sigrdataset == NULL ||
+ (DNS_RDATASET_VALID(sigrdataset) &&
+ !dns_rdataset_isassociated(sigrdataset)));
+
+ if (db->methods->find != NULL) {
+ return ((db->methods->find)(db, name, version, type, options,
+ now, nodep, foundname, rdataset,
+ sigrdataset));
+ } else {
+ return ((db->methods->findext)(db, name, version, type, options,
+ now, nodep, foundname, NULL,
+ NULL, rdataset, sigrdataset));
+ }
+}
+
+isc_result_t
+dns_db_findext(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version,
+ dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+ dns_dbnode_t **nodep, dns_name_t *foundname,
+ dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo,
+ dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
+ /*
+ * Find the best match for 'name' and 'type' in version 'version'
+ * of 'db', passing in 'arg'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(type != dns_rdatatype_rrsig);
+ REQUIRE(nodep == NULL || *nodep == NULL);
+ REQUIRE(dns_name_hasbuffer(foundname));
+ REQUIRE(rdataset == NULL || (DNS_RDATASET_VALID(rdataset) &&
+ !dns_rdataset_isassociated(rdataset)));
+ REQUIRE(sigrdataset == NULL ||
+ (DNS_RDATASET_VALID(sigrdataset) &&
+ !dns_rdataset_isassociated(sigrdataset)));
+
+ if (db->methods->findext != NULL) {
+ return ((db->methods->findext)(
+ db, name, version, type, options, now, nodep, foundname,
+ methods, clientinfo, rdataset, sigrdataset));
+ } else {
+ return ((db->methods->find)(db, name, version, type, options,
+ now, nodep, foundname, rdataset,
+ sigrdataset));
+ }
+}
+
+isc_result_t
+dns_db_findzonecut(dns_db_t *db, const dns_name_t *name, unsigned int options,
+ isc_stdtime_t now, dns_dbnode_t **nodep,
+ dns_name_t *foundname, dns_name_t *dcname,
+ dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
+ /*
+ * Find the deepest known zonecut which encloses 'name' in 'db'.
+ * foundname is the zonecut, dcname is the deepest name we have
+ * in database that is part of queried name.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0);
+ REQUIRE(nodep == NULL || *nodep == NULL);
+ REQUIRE(dns_name_hasbuffer(foundname));
+ REQUIRE(sigrdataset == NULL ||
+ (DNS_RDATASET_VALID(sigrdataset) &&
+ !dns_rdataset_isassociated(sigrdataset)));
+
+ return ((db->methods->findzonecut)(db, name, options, now, nodep,
+ foundname, dcname, rdataset,
+ sigrdataset));
+}
+
+void
+dns_db_attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp) {
+ /*
+ * Attach *targetp to source.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(source != NULL);
+ REQUIRE(targetp != NULL && *targetp == NULL);
+
+ (db->methods->attachnode)(db, source, targetp);
+}
+
+void
+dns_db_detachnode(dns_db_t *db, dns_dbnode_t **nodep) {
+ /*
+ * Detach *nodep from its node.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(nodep != NULL && *nodep != NULL);
+
+ (db->methods->detachnode)(db, nodep);
+
+ ENSURE(*nodep == NULL);
+}
+
+void
+dns_db_transfernode(dns_db_t *db, dns_dbnode_t **sourcep,
+ dns_dbnode_t **targetp) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(targetp != NULL && *targetp == NULL);
+ /*
+ * This doesn't check the implementation magic. If we find that
+ * we need such checks in future then this will be done in the
+ * method.
+ */
+ REQUIRE(sourcep != NULL && *sourcep != NULL);
+
+ UNUSED(db);
+
+ if (db->methods->transfernode == NULL) {
+ *targetp = *sourcep;
+ *sourcep = NULL;
+ } else {
+ (db->methods->transfernode)(db, sourcep, targetp);
+ }
+
+ ENSURE(*sourcep == NULL);
+}
+
+isc_result_t
+dns_db_expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) {
+ /*
+ * Mark as stale all records at 'node' which expire at or before 'now'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0);
+ REQUIRE(node != NULL);
+
+ return ((db->methods->expirenode)(db, node, now));
+}
+
+void
+dns_db_printnode(dns_db_t *db, dns_dbnode_t *node, FILE *out) {
+ /*
+ * Print a textual representation of the contents of the node to
+ * 'out'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(node != NULL);
+
+ (db->methods->printnode)(db, node, out);
+}
+
+/***
+ *** DB Iterator Creation
+ ***/
+
+isc_result_t
+dns_db_createiterator(dns_db_t *db, unsigned int flags,
+ dns_dbiterator_t **iteratorp) {
+ /*
+ * Create an iterator for version 'version' of 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(iteratorp != NULL && *iteratorp == NULL);
+
+ return (db->methods->createiterator(db, flags, iteratorp));
+}
+
+/***
+ *** Rdataset Methods
+ ***/
+
+isc_result_t
+dns_db_findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ dns_rdatatype_t type, dns_rdatatype_t covers,
+ isc_stdtime_t now, dns_rdataset_t *rdataset,
+ dns_rdataset_t *sigrdataset) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(node != NULL);
+ REQUIRE(DNS_RDATASET_VALID(rdataset));
+ REQUIRE(!dns_rdataset_isassociated(rdataset));
+ REQUIRE(covers == 0 || type == dns_rdatatype_rrsig);
+ REQUIRE(type != dns_rdatatype_any);
+ REQUIRE(sigrdataset == NULL ||
+ (DNS_RDATASET_VALID(sigrdataset) &&
+ !dns_rdataset_isassociated(sigrdataset)));
+
+ return ((db->methods->findrdataset)(db, node, version, type, covers,
+ now, rdataset, sigrdataset));
+}
+
+isc_result_t
+dns_db_allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ unsigned int options, isc_stdtime_t now,
+ dns_rdatasetiter_t **iteratorp) {
+ /*
+ * Make '*iteratorp' an rdataset iteratator for all rdatasets at
+ * 'node' in version 'version' of 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(iteratorp != NULL && *iteratorp == NULL);
+
+ return ((db->methods->allrdatasets)(db, node, version, options, now,
+ iteratorp));
+}
+
+isc_result_t
+dns_db_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ isc_stdtime_t now, dns_rdataset_t *rdataset,
+ unsigned int options, dns_rdataset_t *addedrdataset) {
+ /*
+ * Add 'rdataset' to 'node' in version 'version' of 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(node != NULL);
+ REQUIRE(((db->attributes & DNS_DBATTR_CACHE) == 0 && version != NULL) ||
+ ((db->attributes & DNS_DBATTR_CACHE) != 0 && version == NULL &&
+ (options & DNS_DBADD_MERGE) == 0));
+ REQUIRE((options & DNS_DBADD_EXACT) == 0 ||
+ (options & DNS_DBADD_MERGE) != 0);
+ REQUIRE(DNS_RDATASET_VALID(rdataset));
+ REQUIRE(dns_rdataset_isassociated(rdataset));
+ REQUIRE(rdataset->rdclass == db->rdclass);
+ REQUIRE(addedrdataset == NULL ||
+ (DNS_RDATASET_VALID(addedrdataset) &&
+ !dns_rdataset_isassociated(addedrdataset)));
+
+ return ((db->methods->addrdataset)(db, node, version, now, rdataset,
+ options, addedrdataset));
+}
+
+isc_result_t
+dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node,
+ dns_dbversion_t *version, dns_rdataset_t *rdataset,
+ unsigned int options, dns_rdataset_t *newrdataset) {
+ /*
+ * Remove any rdata in 'rdataset' from 'node' in version 'version' of
+ * 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(node != NULL);
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0 && version != NULL);
+ REQUIRE(DNS_RDATASET_VALID(rdataset));
+ REQUIRE(dns_rdataset_isassociated(rdataset));
+ REQUIRE(rdataset->rdclass == db->rdclass);
+ REQUIRE(newrdataset == NULL ||
+ (DNS_RDATASET_VALID(newrdataset) &&
+ !dns_rdataset_isassociated(newrdataset)));
+
+ return ((db->methods->subtractrdataset)(db, node, version, rdataset,
+ options, newrdataset));
+}
+
+isc_result_t
+dns_db_deleterdataset(dns_db_t *db, dns_dbnode_t *node,
+ dns_dbversion_t *version, dns_rdatatype_t type,
+ dns_rdatatype_t covers) {
+ /*
+ * Make it so that no rdataset of type 'type' exists at 'node' in
+ * version version 'version' of 'db'.
+ */
+
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(node != NULL);
+ REQUIRE(((db->attributes & DNS_DBATTR_CACHE) == 0 && version != NULL) ||
+ ((db->attributes & DNS_DBATTR_CACHE) != 0 && version == NULL));
+
+ return ((db->methods->deleterdataset)(db, node, version, type, covers));
+}
+
+void
+dns_db_overmem(dns_db_t *db, bool overmem) {
+ REQUIRE(DNS_DB_VALID(db));
+
+ (db->methods->overmem)(db, overmem);
+}
+
+isc_result_t
+dns_db_getsoaserial(dns_db_t *db, dns_dbversion_t *ver, uint32_t *serialp) {
+ isc_result_t result;
+ dns_dbnode_t *node = NULL;
+ dns_rdataset_t rdataset;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ isc_buffer_t buffer;
+
+ REQUIRE(dns_db_iszone(db) || dns_db_isstub(db));
+
+ result = dns_db_findnode(db, dns_db_origin(db), false, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ dns_rdataset_init(&rdataset);
+ result = dns_db_findrdataset(db, node, ver, dns_rdatatype_soa, 0,
+ (isc_stdtime_t)0, &rdataset, NULL);
+ if (result != ISC_R_SUCCESS) {
+ goto freenode;
+ }
+
+ result = dns_rdataset_first(&rdataset);
+ if (result != ISC_R_SUCCESS) {
+ goto freerdataset;
+ }
+ dns_rdataset_current(&rdataset, &rdata);
+ result = dns_rdataset_next(&rdataset);
+ INSIST(result == ISC_R_NOMORE);
+
+ INSIST(rdata.length > 20);
+ isc_buffer_init(&buffer, rdata.data, rdata.length);
+ isc_buffer_add(&buffer, rdata.length);
+ isc_buffer_forward(&buffer, rdata.length - 20);
+ *serialp = isc_buffer_getuint32(&buffer);
+
+ result = ISC_R_SUCCESS;
+
+freerdataset:
+ dns_rdataset_disassociate(&rdataset);
+
+freenode:
+ dns_db_detachnode(db, &node);
+ return (result);
+}
+
+unsigned int
+dns_db_nodecount(dns_db_t *db) {
+ REQUIRE(DNS_DB_VALID(db));
+
+ return ((db->methods->nodecount)(db));
+}
+
+size_t
+dns_db_hashsize(dns_db_t *db) {
+ REQUIRE(DNS_DB_VALID(db));
+
+ if (db->methods->hashsize == NULL) {
+ return (0);
+ }
+
+ return ((db->methods->hashsize)(db));
+}
+
+isc_result_t
+dns_db_adjusthashsize(dns_db_t *db, size_t size) {
+ REQUIRE(DNS_DB_VALID(db));
+
+ if (db->methods->adjusthashsize != NULL) {
+ return ((db->methods->adjusthashsize)(db, size));
+ }
+
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+void
+dns_db_settask(dns_db_t *db, isc_task_t *task) {
+ REQUIRE(DNS_DB_VALID(db));
+
+ (db->methods->settask)(db, task);
+}
+
+isc_result_t
+dns_db_register(const char *name, dns_dbcreatefunc_t create, void *driverarg,
+ isc_mem_t *mctx, dns_dbimplementation_t **dbimp) {
+ dns_dbimplementation_t *imp;
+
+ REQUIRE(name != NULL);
+ REQUIRE(dbimp != NULL && *dbimp == NULL);
+
+ RUNTIME_CHECK(isc_once_do(&once, initialize) == ISC_R_SUCCESS);
+
+ RWLOCK(&implock, isc_rwlocktype_write);
+ imp = impfind(name);
+ if (imp != NULL) {
+ RWUNLOCK(&implock, isc_rwlocktype_write);
+ return (ISC_R_EXISTS);
+ }
+
+ imp = isc_mem_get(mctx, sizeof(dns_dbimplementation_t));
+ imp->name = name;
+ imp->create = create;
+ imp->mctx = NULL;
+ imp->driverarg = driverarg;
+ isc_mem_attach(mctx, &imp->mctx);
+ ISC_LINK_INIT(imp, link);
+ ISC_LIST_APPEND(implementations, imp, link);
+ RWUNLOCK(&implock, isc_rwlocktype_write);
+
+ *dbimp = imp;
+
+ return (ISC_R_SUCCESS);
+}
+
+void
+dns_db_unregister(dns_dbimplementation_t **dbimp) {
+ dns_dbimplementation_t *imp;
+
+ REQUIRE(dbimp != NULL && *dbimp != NULL);
+
+ RUNTIME_CHECK(isc_once_do(&once, initialize) == ISC_R_SUCCESS);
+
+ imp = *dbimp;
+ *dbimp = NULL;
+ RWLOCK(&implock, isc_rwlocktype_write);
+ ISC_LIST_UNLINK(implementations, imp, link);
+ isc_mem_putanddetach(&imp->mctx, imp, sizeof(dns_dbimplementation_t));
+ RWUNLOCK(&implock, isc_rwlocktype_write);
+ ENSURE(*dbimp == NULL);
+}
+
+isc_result_t
+dns_db_getoriginnode(dns_db_t *db, dns_dbnode_t **nodep) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(dns_db_iszone(db));
+ REQUIRE(nodep != NULL && *nodep == NULL);
+
+ if (db->methods->getoriginnode != NULL) {
+ return ((db->methods->getoriginnode)(db, nodep));
+ }
+
+ return (ISC_R_NOTFOUND);
+}
+
+dns_stats_t *
+dns_db_getrrsetstats(dns_db_t *db) {
+ REQUIRE(DNS_DB_VALID(db));
+
+ if (db->methods->getrrsetstats != NULL) {
+ return ((db->methods->getrrsetstats)(db));
+ }
+
+ return (NULL);
+}
+
+isc_result_t
+dns_db_setcachestats(dns_db_t *db, isc_stats_t *stats) {
+ REQUIRE(DNS_DB_VALID(db));
+
+ if (db->methods->setcachestats != NULL) {
+ return ((db->methods->setcachestats)(db, stats));
+ }
+
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+isc_result_t
+dns_db_getnsec3parameters(dns_db_t *db, dns_dbversion_t *version,
+ dns_hash_t *hash, uint8_t *flags,
+ uint16_t *iterations, unsigned char *salt,
+ size_t *salt_length) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(dns_db_iszone(db));
+
+ if (db->methods->getnsec3parameters != NULL) {
+ return ((db->methods->getnsec3parameters)(db, version, hash,
+ flags, iterations,
+ salt, salt_length));
+ }
+
+ return (ISC_R_NOTFOUND);
+}
+
+isc_result_t
+dns_db_getsize(dns_db_t *db, dns_dbversion_t *version, uint64_t *records,
+ uint64_t *bytes) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE(dns_db_iszone(db));
+
+ if (db->methods->getsize != NULL) {
+ return ((db->methods->getsize)(db, version, records, bytes));
+ }
+
+ return (ISC_R_NOTFOUND);
+}
+
+isc_result_t
+dns_db_setsigningtime(dns_db_t *db, dns_rdataset_t *rdataset,
+ isc_stdtime_t resign) {
+ if (db->methods->setsigningtime != NULL) {
+ return ((db->methods->setsigningtime)(db, rdataset, resign));
+ }
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+isc_result_t
+dns_db_getsigningtime(dns_db_t *db, dns_rdataset_t *rdataset,
+ dns_name_t *name) {
+ if (db->methods->getsigningtime != NULL) {
+ return ((db->methods->getsigningtime)(db, rdataset, name));
+ }
+ return (ISC_R_NOTFOUND);
+}
+
+void
+dns_db_resigned(dns_db_t *db, dns_rdataset_t *rdataset,
+ dns_dbversion_t *version) {
+ if (db->methods->resigned != NULL) {
+ (db->methods->resigned)(db, rdataset, version);
+ }
+}
+
+/*
+ * Attach a database to policy zone databases.
+ * This should only happen when the caller has already ensured that
+ * it is dealing with a database that understands response policy zones.
+ */
+void
+dns_db_rpz_attach(dns_db_t *db, void *rpzs, uint8_t rpz_num) {
+ REQUIRE(db->methods->rpz_attach != NULL);
+ (db->methods->rpz_attach)(db, rpzs, rpz_num);
+}
+
+/*
+ * Finish loading a response policy zone.
+ */
+isc_result_t
+dns_db_rpz_ready(dns_db_t *db) {
+ if (db->methods->rpz_ready == NULL) {
+ return (ISC_R_SUCCESS);
+ }
+ return ((db->methods->rpz_ready)(db));
+}
+
+/*
+ * Attach a notify-on-update function the database
+ */
+isc_result_t
+dns_db_updatenotify_register(dns_db_t *db, dns_dbupdate_callback_t fn,
+ void *fn_arg) {
+ dns_dbonupdatelistener_t *listener;
+
+ REQUIRE(db != NULL);
+ REQUIRE(fn != NULL);
+
+ for (listener = ISC_LIST_HEAD(db->update_listeners); listener != NULL;
+ listener = ISC_LIST_NEXT(listener, link))
+ {
+ if ((listener->onupdate == fn) &&
+ (listener->onupdate_arg == fn_arg))
+ {
+ return (ISC_R_SUCCESS);
+ }
+ }
+
+ listener = isc_mem_get(db->mctx, sizeof(dns_dbonupdatelistener_t));
+
+ listener->onupdate = fn;
+ listener->onupdate_arg = fn_arg;
+
+ ISC_LINK_INIT(listener, link);
+ ISC_LIST_APPEND(db->update_listeners, listener, link);
+
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_db_updatenotify_unregister(dns_db_t *db, dns_dbupdate_callback_t fn,
+ void *fn_arg) {
+ dns_dbonupdatelistener_t *listener;
+
+ REQUIRE(db != NULL);
+
+ for (listener = ISC_LIST_HEAD(db->update_listeners); listener != NULL;
+ listener = ISC_LIST_NEXT(listener, link))
+ {
+ if ((listener->onupdate == fn) &&
+ (listener->onupdate_arg == fn_arg))
+ {
+ ISC_LIST_UNLINK(db->update_listeners, listener, link);
+ isc_mem_put(db->mctx, listener,
+ sizeof(dns_dbonupdatelistener_t));
+ return (ISC_R_SUCCESS);
+ }
+ }
+
+ return (ISC_R_NOTFOUND);
+}
+
+isc_result_t
+dns_db_nodefullname(dns_db_t *db, dns_dbnode_t *node, dns_name_t *name) {
+ REQUIRE(db != NULL);
+ REQUIRE(node != NULL);
+ REQUIRE(name != NULL);
+
+ if (db->methods->nodefullname == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+ return ((db->methods->nodefullname)(db, node, name));
+}
+
+isc_result_t
+dns_db_setservestalettl(dns_db_t *db, dns_ttl_t ttl) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0);
+
+ if (db->methods->setservestalettl != NULL) {
+ return ((db->methods->setservestalettl)(db, ttl));
+ }
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+isc_result_t
+dns_db_getservestalettl(dns_db_t *db, dns_ttl_t *ttl) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0);
+
+ if (db->methods->getservestalettl != NULL) {
+ return ((db->methods->getservestalettl)(db, ttl));
+ }
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+isc_result_t
+dns_db_setservestalerefresh(dns_db_t *db, uint32_t interval) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0);
+
+ if (db->methods->setservestalerefresh != NULL) {
+ return ((db->methods->setservestalerefresh)(db, interval));
+ }
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+isc_result_t
+dns_db_getservestalerefresh(dns_db_t *db, uint32_t *interval) {
+ REQUIRE(DNS_DB_VALID(db));
+ REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0);
+
+ if (db->methods->getservestalerefresh != NULL) {
+ return ((db->methods->getservestalerefresh)(db, interval));
+ }
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+isc_result_t
+dns_db_setgluecachestats(dns_db_t *db, isc_stats_t *stats) {
+ REQUIRE(dns_db_iszone(db));
+ REQUIRE(stats != NULL);
+
+ if (db->methods->setgluecachestats != NULL) {
+ return ((db->methods->setgluecachestats)(db, stats));
+ }
+
+ return (ISC_R_NOTIMPLEMENTED);
+}